Alain and dialists
You will find at
http://www.wengersundial.com/Cylinder/Cylinder.html
information on the cylindrical tower sundial. The problem is an interesting
one with an
interesting solution. I can provide more detail if desired along with the
data values that could
be used to place the
Hello Roger,
You wrote :
My suggestion to calculate the hour lines is to treat the cylinder like a
polygon with a series of flat vertical faces. Calculate the lines for each
face the usual way as a series of vertical declining dials. Lay out the
design for each facet and draw a smooth curve
Hi all,
At the page of Yvon Massé I found a link to a site
by Gérard Baillet.
The site is in French but interesting to
gnomonists.
The addres is : http://perso.wanadoo.fr/gerard.e.baillet/page_spherique.htm
2 small programs may be downloaded.
One program shows a horizontal sundial with
Can anyone on the list help me find the correct email addresses for
Francesco Caviglia (Torino Italy) and
Please respond off-list. Thanks.
Fred Sawyer
Excellent! We now have two elegant solutions proposed: Tony Moss's
orthographic projection and Fear de Varies's mathematics. I need to study
both to understand and use them.
Tony, your sketch is worth 10,000 words. I see from the sketch how things
are laid out and points projected to different
Roger Bailey contributed:
SNIP
Tony, your sketch is worth 10,000 words. I see from the sketch how things
are laid out and points projected to different planes. But I am having some
trouble with the words as you seem to be starting at the solution (P1) and
working back to find the location of
